Flux for use in soldering



Patented Dec. 16, 1930 UNITED STATES PATENT OFFICE HARRY P. CORSON, OF LAKEWOOD, OHIO, ASSIGNOB TO THE GRASSELLI CHEMICAL COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF DELAWARE FLUX non USE m'soLDERmG No Drawing.

The present invention relates to rocesses of uniting metal articles by means a solder in which a sulfonated vegetable oil compound is used as a flux.

I have found that sulfonatedvegetable oils and their various salts, such as alkali-metal, including ammonium salts, particularly those which are water soluble have the properties required of an efficient flux, that is to say, they contribute to the dissolution of the oxide film on the metals to be united and render the molten solder capable of wetting, flowin and spreading over the metal pieces.

Sul onated vegetable oil compounds are well known in the textile industry as Turkey red oils, and under'such trade names as Para soaps, Monopole soaps, Monopole oils, etc. They are suificiently stable at the temperatures used in common soft soldering operago'tions to produce the beneficial effects expected of a practically non-corrosive flux.

Sulfonated corn oil, sulfonated cotton seed oil, sulfonated castor oil and their sodium and ammonium salts are among the commercially available products of this type which I have tested and found to have officient fluxing properties. They are either applied as such, or in the form of their aqueous, alcoholic or other solutions. I have 6 found that alcoholic solutions containing as little as about 10%, and aqueous solutions even down to 5% of a sulfonated vegetable oil have still valuable fluxin properties, though stronger solutions wi pro erties is desired.

y novel fluxes are used in substantially the same manner as common zinc chloride or rosin fluxes and can be used in the same mechanical soldering apparatus where solutions of zinc chloride or rosin are applicable.

Sulfonated vegetable oil' com ounds were found to be particularly usefu in the soft soldering of tin plate,-though on copper and clearly present.

My novel fluxes have the advantage over 'zinc chloride fluxes that they are non-corrosive.

i I claim:

usually be preferred if the full effect of the fluxing zinc coated steel, etc., a fluxing action is also Application filed December 26, 1929. Serial No. 418,754. 

